From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Jia-Ju Bai <baijiaju1990@gmail.com>,
Anna Schumaker <Anna.Schumaker@Netapp.com>,
Sasha Levin <sashal@kernel.org>,
linux-nfs@vger.kernel.org
Subject: [PATCH AUTOSEL 4.9 02/19] fs: nfs: Fix possible null-pointer dereferences in encode_attrs()
Date: Tue, 1 Oct 2019 12:44:48 -0400 [thread overview]
Message-ID: <20191001164505.16708-2-sashal@kernel.org> (raw)
In-Reply-To: <20191001164505.16708-1-sashal@kernel.org>
From: Jia-Ju Bai <baijiaju1990@gmail.com>
[ Upstream commit e2751463eaa6f9fec8fea80abbdc62dbc487b3c5 ]
In encode_attrs(), there is an if statement on line 1145 to check
whether label is NULL:
if (label && (attrmask[2] & FATTR4_WORD2_SECURITY_LABEL))
When label is NULL, it is used on lines 1178-1181:
*p++ = cpu_to_be32(label->lfs);
*p++ = cpu_to_be32(label->pi);
*p++ = cpu_to_be32(label->len);
p = xdr_encode_opaque_fixed(p, label->label, label->len);
To fix these bugs, label is checked before being used.
These bugs are found by a static analysis tool STCheck written by us.
Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
fs/nfs/nfs4xdr.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
index 5e2724a928ed3..d7f8d5ce30e3e 100644
--- a/fs/nfs/nfs4xdr.c
+++ b/fs/nfs/nfs4xdr.c
@@ -1123,7 +1123,7 @@ static void encode_attrs(struct xdr_stream *xdr, const struct iattr *iap,
} else
*p++ = cpu_to_be32(NFS4_SET_TO_SERVER_TIME);
}
- if (bmval[2] & FATTR4_WORD2_SECURITY_LABEL) {
+ if (label && (bmval[2] & FATTR4_WORD2_SECURITY_LABEL)) {
*p++ = cpu_to_be32(label->lfs);
*p++ = cpu_to_be32(label->pi);
*p++ = cpu_to_be32(label->len);
--
2.20.1
next prev parent reply other threads:[~2019-10-01 16:45 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-01 16:44 [PATCH AUTOSEL 4.9 01/19] ima: always return negative code for error Sasha Levin
2019-10-01 16:44 ` Sasha Levin [this message]
2019-10-01 16:44 ` [PATCH AUTOSEL 4.9 03/19] 9p: avoid attaching writeback_fid on mmap with type PRIVATE Sasha Levin
2019-10-01 16:44 ` [PATCH AUTOSEL 4.9 04/19] xen/pci: reserve MCFG areas earlier Sasha Levin
2019-10-01 16:44 ` [PATCH AUTOSEL 4.9 05/19] ceph: fix directories inode i_blkbits initialization Sasha Levin
2019-10-01 16:44 ` [PATCH AUTOSEL 4.9 06/19] ceph: reconnect connection if session hang in opening state Sasha Levin
2019-10-01 16:44 ` [PATCH AUTOSEL 4.9 07/19] drm/amdgpu: Check for valid number of registers to read Sasha Levin
2019-10-01 16:44 ` [PATCH AUTOSEL 4.9 08/19] cdc_ncm: fix divide-by-zero caused by invalid wMaxPacketSize Sasha Levin
2019-10-01 16:44 ` [PATCH AUTOSEL 4.9 09/19] usbnet: ignore endpoints with " Sasha Levin
2019-10-01 16:44 ` [PATCH AUTOSEL 4.9 10/19] net/phy: fix DP83865 10 Mbps HDX loopback disable function Sasha Levin
2019-10-01 16:44 ` [PATCH AUTOSEL 4.9 11/19] thermal: Fix use-after-free when unregistering thermal zone device Sasha Levin
2019-10-01 16:44 ` [PATCH AUTOSEL 4.9 12/19] fuse: fix memleak in cuse_channel_open Sasha Levin
2019-10-01 16:44 ` [PATCH AUTOSEL 4.9 13/19] arcnet: provide a buffer big enough to actually receive packets Sasha Levin
2019-10-01 16:45 ` [PATCH AUTOSEL 4.9 14/19] ppp: Fix memory leak in ppp_write Sasha Levin
2019-10-01 16:45 ` [PATCH AUTOSEL 4.9 15/19] sched/core: Fix migration to invalid CPU in __set_cpus_allowed_ptr() Sasha Levin
2019-10-01 16:45 ` [PATCH AUTOSEL 4.9 16/19] kernel/elfcore.c: include proper prototypes Sasha Levin
2019-10-01 16:45 ` [PATCH AUTOSEL 4.9 17/19] macsec: drop skb sk before calling gro_cells_receive Sasha Levin
2019-10-01 16:45 ` [PATCH AUTOSEL 4.9 18/19] usbnet: sanity checking of packet sizes and device mtu Sasha Levin
2019-10-01 16:45 ` [PATCH AUTOSEL 4.9 19/19] sch_netem: fix a divide by zero in tabledist() Sasha Levin
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